//
//  UIColor+Hex.m
//  MallManage_IOS
//
//  Created by 张浩 on 2023/9/14.
//

#import "UIColor+Hex.h"

@implementation UIColor (Hex)

+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha {
        //删除字符串中的空格
    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
        // String should be 6 or 8 characters
    if ([cString length] < 6) {
        return [UIColor clearColor];
    }
        // strip 0X if it appears
        //如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾
    if ([cString hasPrefix:@"0X"]) {
        cString = [cString substringFromIndex:2];
    }
        //如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾
    if ([cString hasPrefix:@"#"]) {
        cString = [cString substringFromIndex:1];
    }
    if ([cString length] != 6) {
        return [UIColor clearColor];
    }
    
        // Separate into r, g, b substrings
    NSRange range;
    range.location = 0;
    range.length = 2;
        //r
    NSString *rString = [cString substringWithRange:range];
        //g
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
        //b
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    
        // Scan values
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];
}

    //默认alpha值为1
+ (UIColor *)colorWithHexString:(NSString *)color {
    return [self colorWithHexString:color alpha:1.0f];
}

+ (instancetype)gradientColorWithSize:(CGSize)size
                            direction:(GradientColorDirection)direction
                           startColor:(UIColor *)startcolor
                             endColor:(UIColor *)endColor {
    
    if (CGSizeEqualToSize(size, CGSizeZero) || !startcolor || !endColor) {
        return nil;
    }
    
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    gradientLayer.frame = CGRectMake(0, 0, size.width, size.height);
    
    CGPoint startPoint = CGPointMake(0.0, 0.0);
    if (direction == GradientColorDirectionUpwardDiagonalLine) {
        startPoint = CGPointMake(0.0, 1.0);
    }
    
    CGPoint endPoint = CGPointMake(0.0, 0.0);
    switch (direction) {
        case GradientColorDirectionVertical:
            endPoint = CGPointMake(0.0, 1.0);
            break;
        case GradientColorDirectionDownDiagonalLine:
            endPoint = CGPointMake(1.0, 1.0);
            break;
        case GradientColorDirectionUpwardDiagonalLine:
            endPoint = CGPointMake(1.0, 0.0);
            break;
        default:
            endPoint = CGPointMake(1.0, 0.0);
            break;
    }
    gradientLayer.startPoint = startPoint;
    gradientLayer.endPoint = endPoint;
    
    gradientLayer.colors = @[(__bridge id)startcolor.CGColor, (__bridge id)endColor.CGColor];
    UIGraphicsBeginImageContext(size);
    [gradientLayer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage*image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return [UIColor colorWithPatternImage:image];
}

@end
